<!--SIF Implementation Specification 2.2-6 (March 17, 2008)-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" targetNamespace="http://www.sifinfo.org/infrastructure/2.x" xmlns:sif="http://www.sifinfo.org/infrastructure/2.x" elementFormDefault="qualified">
  <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="imports/xml/xml.xsd" />
  <xs:complexType name="LearningStandardDocumentType">
    <xs:sequence>
      <xs:element name="Title" type="xs:normalizedString" />
      <xs:element name="Description" minOccurs="0" nillable="true" type="xs:string" />
      <xs:element name="Source">
        <xs:simpleType>
          <xs:restriction base="xs:token">
            <xs:enumeration value="National" />
            <xs:enumeration value="State" />
            <xs:enumeration value="Regional" />
            <xs:enumeration value="District" />
            <xs:enumeration value="Site" />
            <xs:enumeration value="Classroom" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="Organizations">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="Organization" maxOccurs="unbounded" type="xs:normalizedString" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="Authors" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="Author" minOccurs="0" maxOccurs="unbounded" type="xs:normalizedString" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="OrganizationContactPoint" minOccurs="0" nillable="true" type="xs:string" />
      <xs:element name="SubjectAreas">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SubjectArea" maxOccurs="unbounded" type="sif:SubjectAreaType" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="DocumentStatus">
        <xs:simpleType>
          <xs:restriction base="xs:token">
            <xs:enumeration value="Draft" />
            <xs:enumeration value="Adopted" />
            <xs:enumeration value="Archived" />
            <xs:enumeration value="Unknown" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="DocumentDate" minOccurs="0" nillable="true" type="xs:date" />
      <xs:element name="LocalAdoptionDate" minOccurs="0" nillable="true" type="xs:date" />
      <xs:element name="LocalArchiveDate" minOccurs="0" nillable="true" type="xs:date" />
      <xs:element name="EndOfLifeDate" minOccurs="0" nillable="true" type="xs:date" />
      <xs:element name="Copyright" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="Date" minOccurs="0" nillable="true" type="xs:date" />
            <xs:element name="Holder" minOccurs="0" nillable="true" type="xs:normalizedString" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="GradeLevels" minOccurs="0" nillable="true" type="sif:GradeLevelsType" />
      <xs:element name="RepositoryDate" minOccurs="0" nillable="true" type="xs:date" />
      <xs:element name="LearningStandardItemRefId" type="sif:IdRefType" />
      <xs:element name="RelatedLearningStandards" minOccurs="0" nillable="true">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="LearningStandardDocumentRefId" minOccurs="0" maxOccurs="unbounded" type="sif:IdRefType" />
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_Metadata" minOccurs="0" nillable="true" type="sif:SIF_MetadataType" />
      <xs:element name="SIF_ExtendedElements" minOccurs="0" nillable="true" type="sif:SIF_ExtendedElementsType" />
    </xs:sequence>
    <xs:attribute name="RefId" use="required" type="sif:RefIdType" />
    <xs:attribute ref="xml:lang" use="required" />
  </xs:complexType>

  <xs:element name="LearningStandardDocument" type="sif:LearningStandardDocumentType" />

</xs:schema>